Tobacco

and its dangers

Tobacco smoke• Tobacco smoke contains about 1000

chemicals, many of them being harmful• Smoking kills 12 times the number of

people killed in road accidents• It contains nicotine which is addictive• Tar is a black sticky substance that forms

in the moist lungs• Tar contains 17 chemicals (carcinogens)

that are known to cause cancer• Carbon monoxide is a poisonous gas that

stops red blood cells from carrying oxygen around the body

Heart disease

• Heart disease is 3 times more common among smokers

• Smokers have more chance of a heart attack (when the heart stops working)

Healthy, clean lungs

• A healthy lung looks like a pink sponge

• The air sacs give the lungs a large surface area for gas exchange to take place

• This ensures that enough oxygen gets into the blood and around the body

Lung cancer

• Cancers of the lungs, mouth, gullet (oesophagus), and the bladder are caused by chemicals called carcinogens in tobacco smoke

• 9 out of 10 people who die from lung cancer are smokers

Emphysema

• Emphysema is a lung disease caused by tar.

• Lung tissue is destroyed and large holes develop which blow up like balloons.

• Breathing becomes very difficult.

Bronchitis• This lung disease is usually found in smokers• The air passages (bronchi) to the lungs become

irritated by smoke• These air passages become swollen and sore• There are tiny hairs called cilia which keep

these air passages clear• Smoking damages these cilia and stops them

working• The lungs fill up with mucus which the smoker

now has to try and physically cough up!

Other problems caused by smoking:

• Tobacco smoke is often very unpleasant for other people

• It makes your breath, hair, clothes and house smell• It can irritate those who suffer with hayfever or

asthma• Passive smokers can also develop lung damage• Pregnant mothers who smoke can have smaller babies

than non-smokers. The babies also have an increased risk of getting asthma

• It is thought that smoking in a house may contribute to causing cot deaths

This powerpoint was kindly donated to www.worldofteaching.com

http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.